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CVE-2020-36776

thermal/drivers/cpufreq_cooling: Fix slab OOB issue

MEDIUM
5.5
CVSS Score
Published: February 27, 2024 at 06:40 PM UTC
Updated: June 17, 2026 at 03:16 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: thermal/drivers/cpufreq_cooling: Fix slab OOB issue Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). If power is limited below the power of OPP0 in EM table, it will cause slab out-of-bound issue with negative array index. Return the lowest frequency if limited power cannot found a suitable OPP in EM table to fix this issue. Backtrace: [<ffffffd02d2a37f0>] die+0x104/0x5ac [<ffffffd02d2a5630>] bug_handler+0x64/0xd0 [<ffffffd02d288ce4>] brk_handler+0x160/0x258 [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0 [<ffffffd02d284488>] el1_dbg+0x14/0xbc [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0 [<ffffffd02d75c2e0>] kasan_report+0x10/0x20 [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28 [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4 [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0 [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4 [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294 [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154 [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28 [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac [<ffffffd02d360124>] kthread+0x33c/0x358 [<ffffffd02d289940>] ret_from_fork+0xc/0x18

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v ≥ 4.14.189v ≥ 4.19.134v ≥ 5.4.53v ≥ 5.7.84.14.189 ≤ v < 4.154.19.134 ≤ v < 4.205.11.0 ≤ v < 5.11.205.12.0 ≤ v < 5.12.35.4.53 ≤ v < 5.55.7.8 ≤ v < 5.85.8 ≤ v < 5.10.365.8 ≤ v < 5.11.205.8 ≤ v < 5.12.35.8 ≤ v < 5.135.8.0 ≤ v < 5.10.36371a3bc79c11b707d7a1b7a2c938dc3cc042fffb39e0651cac9c80865b2838f297f95ffc0f34a1d84.14.1894.19.1345.4.535.7.85.89006b543384ab10902819364c1205f11a1458571d3b7bacd1115400b94482dfc7efffc175c29b831febe56f21371ba1e51e8586c3ddf8f54fc62fe61
Vendor states this is fixed in 34ab17cc6c2c1ac93d7e5d53bb972df9a968f085 (fixed)
Vendor states this is fixed in 6bf443acf6ca4f666d0e4225614ba9993a3aa1a9 (fixed)
Vendor states this is fixed in 876a5f33e5d961d879c5436987c09b3d9ef70379 (fixed)
Vendor states this is fixed in c24a20912eef00587416628149c438e885eb1304 (fixed)
Affected range stops below 4.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.20, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 5.10.36 (unaffected)
Vendor states this is fixed in 5.11.20 (unaffected)
Vendor states this is fixed in 5.12.3 (unaffected)
Vendor states this is fixed in 5.13 (unaffected)
Affected range stops below 5.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 5.8 (unaffected)

References (4)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/34ab17cc6c2c1ac93d7e5d53bb972df9a968f085
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6bf443acf6ca4f666d0e4225614ba9993a3aa1a9
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/876a5f33e5d961d879c5436987c09b3d9ef70379
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c24a20912eef00587416628149c438e885eb1304

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-129

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